21023332231 has 4 divisors (see below), whose sum is σ = 22934544264. Its totient is φ = 19112120200.

The previous prime is 21023332201. The next prime is 21023332261. The reversal of 21023332231 is 13223332012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21023332201) and next prime (21023332261).

It is a cyclic number.

It is not a de Polignac number, because 21023332231 - 2¹¹ = 21023330183 is a prime.

It is a super-2 number, since 2×21023332231² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023332201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955606000 + ... + 955606021.

It is an arithmetic number, because the mean of its divisors is an integer number (5733636066).

Almost surely, 2^21023332231 is an apocalyptic number.

21023332231 is a deficient number, since it is larger than the sum of its proper divisors (1911212033).

21023332231 is a wasteful number, since it uses less digits than its factorization.

21023332231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911212032.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21023332231 its reverse (13223332012), we get a palindrome (34246664243).

It can be divided in two parts, 2102 and 3332231, that added together give a palindrome (3334333).

The spelling of 21023332231 in words is "twenty-one billion, twenty-three million, three hundred thirty-two thousand, two hundred thirty-one".